If you have an iPhone...
When the phone is off - Double Click the "Home" button - displays iTunes mini menu.
When the phone is on but "at home" - Double Click "Home" button - display Favorites (contacts)
When the phone is on - Press and hold the "Home" button then press Power button - Generates a screen capture of what is on screen and adds it to your camera roll.
Applications I use:
Pandora - The Music Genome Project - Radio station that plays music you like based on the "type" of music based on artist or song selection. (free)
Yelp - location based recommendations for restaurants, bars etc. (free)
Shazam - Find out what that song is, hold you iPhone near the speaker and let it listen, pretty amazing.(free)
Clinometer - Cool level, yes as in a level to find out if something is "level", not tilted, "geek food". (not free)
NfSCD = "Now for Something Completely Different"